Answer:
What can be swallowed, But can also swallow you?
At night I come without being fetched. By day I am lost without being stolen.
What travels from house to house and is sometimes narrow and sometimes wide but always stays outside?
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves every day. What am I?
What is lighter than what it is made of?
What sphinxes employ and players enjoy.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?